摘要
标准养护条件下,采用固体废弃物铁尾矿砂代替石英砂设计制备RPC,研究其引入对RPC工作性能、强度和弯曲韧性的影响,通过XRD和SEM研究其对RPC水化反应和微观结构的影响。结果表明,标准养护条件下,铁尾矿砂RPC28d抗压强度和抗弯拉强度可分别达到117.5 MPa和24.2 MPa;铁尾矿砂的引入可降低RPC流动度、抗压强度和抗弯拉强度;采用美国ASTM C1609和日本JCI SF4评价测试铁尾矿砂RPC弯曲韧性,韧性指数I_(10)和σ_(b)分别为石英砂RPC的78.0%和77.8%;微观分析表明,少量铁尾矿砂对RPC内部水泥水化反应影响并不明显,继续增加铁尾矿砂的量会对水化反应产生不利影响。
This design of iron tailings sand instead of quartz sand is used to prepare RPC under standard maintenance conditions,and the influence of its introduction on the working performance,strength and bending toughness of RPC is studied.Its influence on RPC hydration reaction and microstructure is investigated by XRD and SEM.The results show that under standard curing conditions,the compressive strength and flexural strength of iron tailings sand RPC28 d can reach 124.5 MPa and 26.2 MPa,respectively.The introduction of iron tailings sand can reduce the fluidity,compressive strength and flexural strength of the RPC.ASTM C1609 and JCI SF4 are used to evaluate the bending toughness of iron tailings sand RPC and the toughness indices of I_(10) andδ_(b) are 78.0%and 77.8%of quartz sand RPC.Microscopic analysis shows that an appropriate amount of iron tailings can promote cement hydration reaction and the hydration reaction can be adversely affected if the amount of iron ore tailings continues increasing.
作者
田耀刚
阎宝宝
陈惠坤
黄山
齐琳
李炜光
TIAN Yaogang;YAN Baobao;CHEN Huikun;HUANG Shan;QI Lin;LI Weiguang(School of Materials Science and Engineering, Chang'an University, Xi'an 710064, China;School of Highway, Chang'an University, Xi'an 710064, China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2021年第4期4153-4159,共7页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51878065,51908058)。
关键词
标准养护
铁尾矿砂
RPC
力学性能
弯曲韧性
微观结构
standard curing condition
iron tailings
RPC
mechanical properties
bending toughness
microstructure
